Double-walled tear strip carton and blank therefor



Dec. 15, 1964 s. A. SVENSSON ,3 6

DOUBLE-WALLED TEAR STRIP CARTON AND BLANK THEREFOR Filed July 8, 1963 I 6 Sheets-Sheet 1 FIG. I

INVENTOR SOLDA/V A. SVEIVSSON ATTORNEY Dec. 15, 1964 s. A. SVENSSON 3,

DOUBLE-WALLED TEAR STRIP CARTON AND BLANK THEREFOR Filed July 8, 1963 6 Sheets-Sheet 5 INVENTOR SOLDAN A. SVE/VSSON BY QMLW ATTORNEY Dec. 15, 1964 s. A. SVENSSON 3,161,346

DOUBLE-WALLED TEAR STRIP CARTON AND BLANK THEREFOR Filed July 8, 1963 6 Sheets-Sheet 4 s 56&

F G. 9 INVENTOR SULDAN A. SVEWSSUN BY A n W4 ATTORNEY Dec. 15, 1964 s. A. SVENSSON 3,

DOUBLE-WALLED TEAR STRIP CARTON AND BLANK THEREFOR Filed July 8, 1963 6 Sheets-Sheet 5 soi F/GJZ INVENTOR SOLDAN A. SVENSSON BY hom...

ATTORNEY Dec. 15, 1964 s. A. SVENSSON 3,161,346

DOUBLE-WALLED TEIAR STRIP CARTON AND BLANK THEREFWR Filed July 8. 1963 6 Sheets-Sheet 6 INVENTOR SOLDAN A. SVEIVSSON ATTORNEY v United States Patent 3,161,346 DOUBLE-WALLED TEAR STRIP CARTON AND BLANK THEREFOR Soldan A. Svensson, Tuscaloosa, Aia., assignor to Gulf States Paper Corporation, Tuscaloosa, Ala., a corporation of Delaware Filed July 8, 1963, Ser. No. 293,432 7 Claims. (Ci. 229-51) This invention relates to cartons or containers of the type formed from a single blank of foldable sheet material, such as paperboard, cardboard, or other relatively light weight material, and consists more particularly in new and useful improvements in a container of the general type disclosed in my copending application Serial No. 241,858, filed December 3, 1962. As in said copending application, the container of the present invention is substantially rectangular in shape, and the single blank from which it is formed is designed to provide a readily reclosable hinged cover for the protection of the contents of the carton after having once been opened.

An object of the invention is to provide a container which may be semi-fabricated and collapsed for shipment and which, in use, provides a tube having two initially open end portions for product filling and subsequent permanent closure, and including a cover portion having front and end apron flaps designed to coact with one another and with respective body walls and end flaps to provide a reclosable cover having effective shape retaining qualities.

Another object of the invention is to provide a carton of this type wherein the single blank from which the carton is formed comprises a main body forming section and a contiguous lining forming section, said sections being foldable on crease lines so that the relationship of the liner section to the body section provides, in effect, a double-walled carton for insurance against leakage.

A further object of the invention is to provide a container of economical construction which, due to the double walled feature above referred to, enables the utilization of far less expensive box board than would ordinarily be required to provide the necessary strength and rigidity.

Still another object of the invention is to provide a container requiring a minimum of adhesive coated areas, while at the same time providing the necessary strength and protection for a container of this type.

A still further object of the invention is to provide a container which may be filled at either end and thereafter completely sealed with the use of conventional machinery.

Still another object of the invention is to provide a container which may be easily and simply opened by the consumer and repeatedly closed after the intermittent removal of the contents thereof.

With the above and other objects in view which will appear as the description proceeds, the invention consists in the novel features herein set forth, illustrated in the accompanying drawings and more particularly pointed out in the appended claims.

Referring to the drawings in which numerals of like character designate similar parts throughout the several views:

FIG. 1 is a plan view showing the inner face of a blank of paperboard or the like from which one embodiment of the container of the present invention is formed;

FIG. 2 is a generally similar view of the blank illustrating the first step in fabrication;

FIG. 3 is a perspective view of the blank after the top, bottom and side walls have been folded and sealed to provide an open-ended tube;

FIG. 4 is a similar view showing one end of the car- "ice ton with the end flaps in the course of being folded for sealing;

FIG. 5 is a perspective view looking at the top and one side wall of the carton with the end flaps folded and sealed;

FIG. 6 is a perspective view of the sealed carton showing the location of the tear strip;

FIG. 7 is a similar view with the tear strip in the course of removal;

FIG. 8 shows the carton with the tear strip removed and the reclosable cover in open position;

FIG. 9 is a view similar to FIG. 1 showing a blank of paperboard or the like designed to provide a modified carton embodying the present invention;

FIG. 10 is a view similar to FIG. 2 illustrating the first step in fabrication of the modified carton;

FIG. 11 is a perspective view of the modified carton with its top, bottom and side walls folded and sealed, but with the end flaps in open position;

FIG. 12 is a similar view with the flaps at one end folded and those at the opposite end in the course of being folded;

FIG. 13 shows the completely sealed modified carton;

FIG. 14 is a perspective view illustrating the position of the tear strip in one end of the front wall;

FIG. 15 is a similar view with the tear strip in the course of removal; and

FIG. 16 shows the modified carton with the tear strip completely removed and the cover in open position.

In the form of the invention illustrated in FIGS. 1-8 inclusive, the reclosable cover or top is formed by one of the wide side walls of the carton, providing a relatively shallow container, as distinguished from the form shown in FIGS. 916 inclusive, where the closure is formed by one of the narrow side walls, so as to provide a relatively deep container. As will be apparent from the description which follows, the basic principle embodied in both forms of the invention is substantially the same, although certain specific details are modified to meet the particular requirements of form.

Referring first to FIG. 1 of the drawings, the blank of paperboard or the like from which this form of the invention is fabricated consists of a main body section, generally indicated by the numeral 20, and an integral liner section of reduced width, generally indicated by the numeral 21. In the die-cutting of this blank, the portion forming the body section 20 is provided with top and bottom wall panels 22 and 23, respectively connected by crease lines 24 and 25 to an intervening side wall panel 26. The opposite edge of the bottom wall panel 23 is connected by a crease line 27 to another side wall panel 28.

Integral with the body section 20, the liner section 21 comprises a top wall liner panel 29 connected to the body side wall panel 28 by a crease line 30, and a bottom wall liner panel 31, a side wall liner panel 32 being interposed between the liner panels 29 and 31 and connected by crease lines 33 and 34. Another side wall liner panel 35 is connected to the edge of bottom wall liner panel 31 by crease line 35c.

As will be seen in FIG. 1, all of the crease lines just referred to are parallel and extend transversely of the blank so that each of the individual panels of the body and liner sections can be progressively folded, as will hereinafter appear, to provide a double-walled, tubular container.

Returning to the body section 20, it will be seen that in line with the respective longitudinal bounding edges of the liner section 21, the body section 20 is provided with parallel, laterally spaced crease lines 36 and 37 which extend for the entire length of the body section. These crease lines defines the inner extremities of a series of foldable end flaps which are integral with the respective body panels and project laterally on opposite sides of the body section beyond the bounding edges of the liner section 21. Thus, the body top panel 22 carries a pair of relatively short, oppositely projecting flaps 22a and 22b; the side panel 26 carries a pair of slightly longer end flaps 26a and 26b; the bottom panel 23 carries still longer end flaps 23a and 23b; and the other side panel 28 carries end flaps 28a and 28b of substantially the same length as the end flaps 23a and 23b.

The free edge of the top panel 22 is coated along its inner surface with a strip of suitable adhesive 38, and the top end flaps 22a and 22b are similarly coated as at 39 and 40 respectively.

The side wall panel 28 is provided with a pair of spaced, lateraly cut lines 41, extending entirely across the panel 28 and its end fiaps 28a and 28b and defining a tear strip 42, provided at one end with a pull tab 43. The inner faces of the end flaps 28a and 28b are provided adjacent their lateral extremities with adhesive strips 44 and 45 respectively, which terminate adjacent the tear strip 42, the remaining portions of the end flap edges being free of adhesive.

The side wall liner panel 35 at the lower extremity of the blank is provided with a pair of oppositely projecting end flaps 35a and 35b which are joined to the liner panel 35 along crease lines 36a and 37a, which are aligned with the bounding edges of the liner panel 21 and the crease lines 36 and 37 respectively of the body section 20. Preferably, the end flaps 35a and 35b are downwardly inclined along their edges which join the liner bottom panel 31, as seen in FIG. 1.

The sequential steps followed in erecting the carton comprising this form of the invention are as follows: The liner panels 35, 31, 32 and 29 are sequentially folded in tubular form along the respective crease lines 35c, 34, 33 and 30, as shown in FIG. 2, so that the outer surface of the liner side panel 35 lies in contact with the inner surface of the body side panel 28. In this position, the liner ends flaps 35a and 35b are still in extended position and lie against the inner surfaces of the end flaps 28a and 28b of the body side panel 28. The panels of the body section are then sequentially folded on crease lines 27, and 24 so as to overlie the corresponding liner panels, as shown in FIG. 3. Thus, the body bottom panel 23 overlies the liner bottom panel 31; the body side panel 26 overlies the liner side panel 32; and the body top panel 22 overlies the liner top panel 29, all of the end flaps of said body panels remaining in extended positions. At this point, the adhesive strip 38 on the inner face of the edge of top panel 22, as shown in dotted lines in FIG. 3, engages the corresponding edge of the underlying liner top panel 29, providing a tubular structure wherein each of the panels of the body section is aligned with a corresponding liner panel.

As previously stated, the carton of the present invention may be filled from either end, and before this filling operation, one end of the double-walled, tubular carton is closed. Both ends of the carton are closed by a similar sequence of steps and an explanation of the closure of one end will suflice for both. Referring to FIG. 4, end flap 23a is first folded inwardly along crease line 36 and completely covers the open end of the tube. Following this, end flap 26a is folded on crease line 36 so as to overlie and partially cover end flap 23a. Then, in one operation, body end flap 28a and liner end flap 35a are folded inwardly on crease lines 36 and 36a respectively. Liner end flap 35a, being of substantially the same length as the opposite body end flap 26a, terminates with its free edge lying adjacent the free edge of flap 26a, as best seen in FIG. 7. However, inasmuch as body end flap 28a is slightly longer, its adhesive coated free edge 44 overlaps the free edge of body end flap 26a to which it is sealed by the adhesive. Finally, the narrow body top end flap 22a is folded downwardly and sealed to the upper edge of the body side wall end flap 28a by ill the adhesive strip 39. The rear end of flap 22a adjacent the hinge or crease line 24 is free of adhesive to permit opening of the carton top, as will later appear, so that the actual sealing of the end of the carton is effected by the adhesive strip 44 on the side wall end flap 28a and strips 38 and 39 on the top panel 22.

After the carton has been filled with product and sealed at both ends, it appears as shown in FIGS. 5 and 6. in order to open the carton, the consumer grasps the pull tab 43 and removes the tear strip 42, as shown in FIG. 7, thereby severing the top edges of end flap 28:1, body side wall panel 2 3, and end flap 2%, the severed portions of end flaps 28a and 2.8:) remaining attached to the top closure. The top closure formed by the top body panel 22, end flaps 22a and 22b, and the severed portion of the front side wall panel 28 may now be swung upwarly on the hinged connection formed by the registering crease lines 24 and 33, as shown in FiG. 3. Here it will be seen that the shape of the top closure is maintained by the depending apron formed by the top panel end flaps and 225 which are sealed to the underlying severed portions of end flaps 28a and 23!), the latter being connected at their crease lines 36, 37 to the severed portion of front Wall flap 28. As previously explained, the rear ends of end flaps 22a and 225 are free of adhesive so that they do adhere to the underlying end laps 26a and 26!), thus providing a free swinging action on the closure hinge.

The contents of the carton may now be removed intermittently and the top closure reclosed, the upper contiguous edges of the body end fiap 26a, liner end flap 35a, liner front side wall 35, liner end flap 35b, body end flap 26b, and the underlying body end Walls 23a and 23b, forming an upstanding lip which is engageable by the depending apron portion of the top closure. Thus, the liner section serves the dual purpose of providing a double-walled carton, and, at the same time, acting as a lip which coacts with the top closure.

In the modified form of the invention illustrated in FIGS. 9-16, the blank shown in FIG. 9 is designed to provide a relatively deep carton which opens at one of its narrow sides, although the basic features of the structure just described are maintained. Here, the blank comprises a body section 50 and an integral liner section 51, and, as in the other form of the invention, the body section is provided with top and bottom wall panels 52 and 53, respectively connected by crease lines 54 and 55 to an intervening side Wall panel 56. The opposite edge of the bottom wall panel 53 is connected by crease line 57 to another side wall panel 58. As will be seen, the top and bottom side wall panels 52 and 53 are relatively narrow, While the side wall panels 56 and 58 are deep.

Integral with the body section 50, the liner section 51 comprises a top wall liner panel 59 connected to the body side wall panel 58 by a crease line 60, and a bottom wall liner panel 61, a side wall panel 62 being interposed between said liner panels 59 and 61 and connected by crease lines 63 and 64. Another side wall liner panel 65 is connected to the edge of bottom wall liner panel 61 by a crease line 65a.

In line with the longitudinal bounding edges of the liner section 51, the body section 50 is provided with parallel, laterally spaced crease lines 66 and 67 which extend for the entire length of the body section and define the inner extremities of a series of foldable end flaps which are integral with the respective body panels and project laterally on opposite sides of the body section beyond the bounding edges of the liner section 51. The body top panel 52 carries a pair of relatively short, oppositely projecting flaps 52a and 52b; the side panel 56 carries a pair of longer end flaps 56a and 56!); the bottom panel 53 carries a pair of end flaps 53a and 53b; and the side panel 58 carries end flaps 58a and 58b of substantially the same length as end flaps 56a and 56b.

The free edge of the top panel 52 is coated along its J underside with a strip of suitable adhesive 68, while as distinguished from the top flap 22 in the other form of the invention, the end flaps 52a and 52b are not coated.

The front side wall panel 58 is provided with a pair of spaced, laterally extending cut lines 73 running the entire length of the panel 58 and its end flaps 58a and 58b and defining a tear strip 74, provided at one end with a pull tab 75.

With particular reference to the bottom panel end fiaps 53a and 53b and the side wall panel end flaps 58a and 58!), it will be noted that the contours of end flaps 53a and 53b are designed to accommodate certain adhesive coated areas of end flaps 58a and 58b when folded, as will later appear. To this end, cut-out areas 690 and 71a are provided in corresponding edges of end flaps 53a and 53]) respectively, to accommodate adhesive strips 69 and 71 on the outer edges of end flaps 58a and 58b when folded. These adhesive strips 69 and 71 respectively terminate at one end adjacent the cut line 73, forming the tear strip 74, and at right angles to these adhesive strips, the edges of these end flaps are provided with adhesive strips 70 and 72, contiguous with adhesive strips 69 and 71 respectively. The edges of fiaps 58a and 58b, opposite adhesive strips 70 and 71, are coated with adhesive, as at 76 and 77 respectively.

The sequence of steps followed fied carton is generally the same scribed in connection with the blank shown in P16. 1, although the folding of the end flaps differs to some extent. More specifically, the liner panels 65, 61, 62 and 59 are sequentially folded in tubular form along the respective crease lines 65a, 64, 63 and 69. This brings the outer surface of the liner top panel 65 in register with the inner surface of the body top panel 58 and, in this position, all of the body end flaps are still extended. The panels of the body section 50 are then folded on crease lines 57, 55 and 54 so as to overlie the corresponding liner panels as shown in FIG. 11. Thus, the body side panel 58 overlies the liner side panel 65; the body bottom panel 53 overlies the liner bottom panel 61; the body side panel 56 overlies the liner side panel 62; and the body top panel 52 overlies the liner top panel 59, with all of the end flaps of the body panels remaining extended. The blank is then sealed in this double-walled, tubular form by means of the adhesive strip 68 on the inner face of the body top panel 52 which engages the corresponding edge of the underlying liner top panel 59.

The folding sequence for closing the end flaps is the same .at both ends, and a description of one will suffice, reference being had to FIG. 12 which shows the carton with one end already closed. End flap 56a is first folded inwardly so as to completely overlie the end of the tubular carton, and following this, end flap 53a is folded to overlie flap 56a as shown in dotted lines in FIG. 12. End flap 52a is then folded inwardly to overlie the opposite edge of end flap 56a. These three folded end flaps are now in position for sealing engagement with adhesive strips 69, 7t) and 76 on the remaining end flap 58a. and when the latter is folded inwardly, sealing strip 76 engages the hinged edge of end flap 53a, sealing strip 69 engages the hinged edge of end flap 56a through the cut-out area 69a in end flap 53a, and sealing strip 7 6 engages the outer face of end flap 52a. Thus, the end flap 58a is tightly sealed to selected areas of all three of the underlying end flaps, completing the sealing of the package, which now appears as shown in FIGS. 13 and 14.

The procedure for opening this modified carton is the same as that previously described in connection with the other form of the invention. As seen in FIG. 15, this carton is opened from one of its narrow sides and is relatively deep. The pull tab 75 is grasped by the consumer and the tear strip removed from end flap 58a, body panel 58, and end fiap 58b, freeing the upper edges of panel 58 and end flaps 58a and 58b, said end flaps remaining adhered to the underlying end flaps m and 52!) in erecting this modias that previously deof the body top panel 52. The top closure can now be swung upwardly on its hinged connection formed by the registering crease lines 54 and 63 of the body and liner panels respectively, as seen in FIG. 16. As in the other form of carton, this leaves an upstanding lip formed by the exposed upper edges of end flaps 56a and 56b and the liner panel which facilitates the reclosing 0f the carton.

In both forms of the invention, it will be apparent that a rugged, double-walled carton is provided which may be readily assembled and filled with conventional equipment. The arrangement and distribution of adhesive on the foldable end flaps not only tightly seals the carton when initially filled and closed, but maintains the necessary reinforcement and shape of the reclosable cover. Also, as previously pointed out, by designing the blank with an integral liner section, the double-walled feature enables the use of considerably less expensive material in the formation of a rugged carton.

From the foregoing, it is believed that the invention may be readily understood by those skilled in the art without further description, it being borne in mind that numerous changes may be made in the details disclosed without departing from the spirit of the invention as set forth in the following claims.

I claim:

1. A carton comprising a single blank of suitable sheet material having a liner section and an integral body section foldably connected at adjacent longitudinal extremities; a series of longitudinally spaced, transverse crease lines in said liner section defining, in sequence from its junction with said body section, a top panel, a front side panel, a bottom panel, and a rear side panel, respectively foldable on said crease lines to form a tubular liner; a corresponding series of longitudinally spaced, transverse crease lines in said body section defining panels complementary to said liner panels and foldable in tubular form on said last-named crease lines to overlie corresponding liner panels, with corresponding crease lines of said liner and body panels in registering relation; adhesive means on the inner face of said body top panel adjacent the free transverse edge thereof, engageable with the outer face of the underlying liner top panel for securing respective liner and body panels in concentric tubular form; each of said body panels terminating at opposite extremities in laterally projecting end flaps, respectively foldable inwardly in overlapping relation on parallel crease lines extending longitudinally through said body section in line with opposite lateral boundaries of said liner sections; adhesive means on certain end flaps securing all of said end flaps in overlapping relation; a downwardly spaced tear strip extending transversely entirely across said body front side panel and its end flaps and free from the underlying liner front side panel and the body rear side panel end flaps; said body top panel and said liner top panel, upon removal of said tear strip, remaining hingedly supported above the tear strip on the upper extremities of respective body and liner rear side panels, along their adjacent registering crease lines; the severed upper edges of said body front side panel and its end flaps, together with the connected body top panel end flaps, forming a contiguous depending three-sided apron; the upper edges of said liner front panel and the end flaps of said body rear side panel jointly providing a continguous three-sided upstanding lip over which said depending apron engages.

2. A blank of paperboard or the like for forming a substantially rectangular carton, said blank comprising a body section transversely creased to form a plurality of foldable top, bottom and front and rear side panels, a longitudinal extension of said body section forming a liner section creased to form complementary foldable panels, the panels of said body section being foldable over corresponding panels of said liner section with corresponding crease lines of said liner and body panels in registering relation to form a double-walled tube, flap members integrally hinged to the respective end edges of the panels of said top section which, when said liner section and body section are folded in double-walled tubular form, are foldable inwardly in overlapping relation to form end walls, adhesive means for securing said body section and liner section in tubular form and for securing said end flaps in overlapping relation, a tear strip spaced downwardly from the edge of the body top panel and extending transversely around the end flaps and the body front side panel, whereby when said carton is assembled and said tear strip removed, the upper portions of said body end flaps and front side panel are severed from the lower portions thereof to thereby provides a cover jointly hinged to the upper extremities of the body and liner rear side panels the severed portions or" said body end flaps and front side panel forming a contiguous depending threesided apron adapted to overlap the upstanding, underlying portions of said end flaps and liner front side panel.

3. A carton formed from a blank of paperboard or the like which is cut and scored to provide a liner section and an integral body section, said liner section and body section adapted to be overlapped to form a doublewalled tube closed at one end for filling through the other end, which is thereafter closed, said carton having inner and outer top, bottom, front and rear side walls and end walls, the end walls each comprising flap members integrally hinged to respective end edges of the outer top, bottom and side walls and secured in inwardly folded, overlapping relation, adhesive means securing said flap members in folded relation, wardly from the edge of said ing transversely around the outer side and front walls and terminating adjacent the outer rear Wall, said tear strip, upon removal, being adapted to sever the upper portions of said outer side and front Walls from their respective lower portions, exposing and forming a threesided upstanding lip of the underlying upper portions of the inner front and end walls, to thereby provide a cover outer top wall and extenda tear strip spaced downformed by the inner and outer top Wall, jointly hinged to the upper extremities of respective inner and outer rear Walls, and the severed portions of said outer end and front walls forming a contiguous three-sided depending apron adapted to overlap the upstanding lip formed by said exposed inner wall portions.

4. A carton as claimed in claim 3, wherein said body and liner sections are retained in double-walled tubular form solely by adhesive means securing the free lateral edge of the body top wall to the underlying edge of the liner top wall.

5. A carton as claimed in claim 4, wherein adhesive means on one end flap of each set seals all of the flap members of respective sets in folded condition.

6. A carton as claimed in claim 3, wherein said adhesive means for securing said flap members in folded relation comprises an adhesive strip extending only partially along the outer edges of respective front wall end flap members, those portions of respective front wall end fiap members forming the ends of said depending apron being free of adhesive to permit displacement of the severed portion forming said depending apron with respect to said upstanding lip.

7. A carton as claimed in claim 5, wherein said top wall end flap members are relatively short and are sealed to the severable upper portions of said front wall end flap members to retain the angular shape of the severed apron and top Wall.

References Cited by the Examiner FRANKLIN T. GARRETT, Primary Examiner. 

1. A CARTON COMPRISING A SINGLE BLANK OF SUITABLE SHEET MATERIAL HAVING A LINER SECTION AND AN INTEGRAL BODY SECTION FOLDABLY CONNECTED AT ADJACENT LONGITUDINAL EXTREMITIES; A SERIES OF LONGITUDINALLY SPACED, TRANSVERSE CREASE LINES IN SAID LINER SECTION DEFINING, IN SEQUENCE FROM ITS JUNCTION WITH SAID BODY SECTION, A TOP PANEL, A FRONT SIDE PANEL, A BOTTOM PANEL, AND A REAR SIDE PANEL, RESPECTIVELY FOLDABLE ON SAID CREASE LINES TO FORM A TUBULAR LINER; A CORRESPONDING SERIES OF LONGITUDINALLY SPACED, TRANSVERSE CREASE LINES IN SAID BODY SECTION DEFINING PANELS COMPLEMENTARY TO SAID LINER PANELS AND FOLDABLE IN TUBULAR FORM ON SAID LAST-NAMED CREASE LINES TO OVERLIE CORRESPONDING LINER PANELS, WITH CORRESPONDING CREASE LINES OF SAID LINER AND BODY PANELS IN REGISTERING RELATION; ADHESIVE MEANS ON THE INNER FACE OF SAID BODY TOP PANEL ADJACENT THE FREE TRANSVERSE EDGE THEREOF, ENGAGEABLE WITH THE OUTER FACE OF THE UNDERLYING LINER TOP PANEL FOR SECURING RESPECTIVE LINER AND BODY PANELS INCONCENTRIC TUBULAR FORM; EACH OF SAID BODY PANELS TERMINATING AT OPPOSITE EXTREMITIES IN LATERALLY PROJECTING END FLAPS, RESPECTIVELY FOLDABLE INWARDLY IN OVERLAPPING RELATION ON PARALLEL CREASE LINES EXTENDING LONGITUDINALLY THROUGH SAID BODY SECTION IN LINE WITH OPPOSITE LATERAL BOUNDARIES OF SAID LINER SECTIONS; ADHESIVE MEANS ON CERTAIN END FLAPS SECURING ALL OF SAID END FLAPS IN OVERLAPPING RELATION; A DOWNWARDLY SPACED TEAR STRIP EXTENDING TRANSVERSELY ENTIRELY ACROSS SAID BODY FRONT SIDE PANEL AND ITS END FLAPS AND FREE FROM THE UNDERLYING LINER FRONT SIDE PANEL AND THE BODY REAR SIDE PANEL END FLAPS; SAID BODY TOP PANEL AND SAID LINER TOP PANEL, UPON REMOVAL OF SAID TEAR STRIP, REMAINING HINGEDLY SUPPORTED ABOVE THE TEAR STRIP ON THE UPPER EXTREMITIES OF RESPECTIVE BODY AND LINER REAR SIDE PANELS, ALONG THEIR ADJACENT REGISTERING CREASE LINES; THE SEVERED UPPER EDGES OF SAID BODY FRONT SIDE PANEL AND ITS END FLAPS, TOGETHER WITH THE CONNECTED BODY TOP PANEL END FLAPS, FORMING A CONTIGUOUS DEPENDING THREE-SIDED APRON; THE UPPER EDGES OF SAID LINER FRONT PANEL AND THE END FLAPS OF SAID BODY REAR SIDE PANEL JOINTLY PROVIDING A CONTINGUOUS THREE-SIDED UPSTANDING LIP OVER WHICH SAID DEPENDING APRON ENGAGES. 